Transmitter.



v PATENTED SEPT. 1, 1908.

5. T. GURTlS. TRANSMITTER.

APPLICATION FILED MAR.25,1907.

ATTORNEYS WITNESSES I a/1w, a j

'culzir frame 5.

- mode of metal.

posed within the sunlren tTiFFi S/E Application filed liarch 25, 1997.

To all whom it may concern:

Be it known that i, Jiassn T Tie, a citizen of the United States, and aresident of Bement, in the county of :tintt end State of Illinois, haveinvented a. new end Improved Transmitter, ofwhieh the following is alull, clear, and exact deseriptlon.

. My invention relates to trimsmitters, my object being to improve theconstruction and action as hereinafter eXpluiI-ied.

telerenee is to no hard to the aeeon'ipa-ny ing drawings forming it partof this specifies-- tien, in which similar characters of referenceindicate eorrespoinling parts in all the tigures.

Figure l is an enlarged vertieul seetion through :i transmitter equippedwith my several improvements; and Fig. 2 is :1- rear view ol themmismitter, the easing being removed.

The mouth piece is shown at It ulnd serews into an annular head tintegrnl with the eir- An annular groove (3 is sunken into the rear sideof l. frame so as to leave an annular wall 7. substantiallyhemispherienl easing 8 lit nfound this wall 7 and protects. the internalortions of the mechanism.

The diaphragm is shown and its peripherul edge is heul in position by 8,ring it) of resilient l'llztltilitl, n'eleru-hly sott rnhher. This(linphrzign'x is provided with a sunken portion ll huving a hit bottom12, the hitler being provided with n eonenve portion l3, and disposedeentrnlly oi this eonenve por tion is an aperture ii. The diaphragm is AlllQidtlliif eup l5 halving with 'l a general cylindrical form isprovided on annular flange 16 mte til therewith. mien diaphragm l7 ofeneulnr form is (ilFr portion ll of the l) and has its outer edgesclumped he bottom l2 and liunge H3. The book eleetrode wliieh moves withthe din phrngm is shown at l8 and is preferably ol' enrhon. The fronteleetrode lit is sin-time airy and is nlso preferably of eurlmn.intermediate ol the eleetrodes is n space 20 filled with granulatedesrhon. A metallic dish 21 is engaged by thediaphrztgm l7 and supportsthe front electrode 19. The cup 15 is mounted upon the diaphragm it byforcing the outer edges of the annular flange. 16 into close engagementwith the sunken portion .1] ol the diaphragm. in other words, the flange16 is sprung into the sunken portion diaphragm intermediate ol 1' hiseiroulor EHPLE [)i'uwith n revoluhle nut 22, diaphragm ll against thedisk 21.

l l l l l l Patented Sept. 1, 1908.

ileriztl 110. 364,300.

nod holds firmly therein. by its pressure. A stem 23 is threadedexternally and is fitted whieh eluinps the A metullie clumping ring 22"holds the front electrode ll) upon the. disk 21. The stem 23 projeetsloosely through the aperture 14.

The l'rmne .3 is provided with n eentral aperture 24 through which thestem 23 extends. An adjusting nut is made hollow and is threaded bothii'ite'rnully and externally, us will he understood from Fig. l. Fittedexte'riorly upon this adjusting nut 25 is u jitlil nut 2o, threadedinternally to fit the some. The adjusting nut 25 is provided with itslot 2.7 into whieh n. serew driver may he inserted for the purpose ol'turning the {idjusting nut '25. By aid of :1 serew driver insertedwithin the slot 27, the adjusting nut run h held stationary while thejoin nut so is turned in either diree'iion. The adjusting nut ZS-isenlarged at one of its ends, and is provided with slots .Zo' erossingeach other. This gives it n eertnin amount of resilience, and preventsit binding unduly upon the stem loosening the jam nut 26 and turning theadjusting nut 2.3, the stem 23 eon he drown toward the right or loreedtoward the left, us the eztse may he, neeording to Fig. l. and thus therelative distance of the front elee'trode 19 and hook elootrode l8 eonoe varied at will. In consequence of this, the dinphrogm i) may hetigl'itene'd or loosened to any desired extent, and the amount of playhetween "the fronteleetrode l9 and the dinphrugin i) nury he alsocontrolled at will. .llisposed respeelivelv at the top and bottom of thetransmitter nle lugs 28), 30. 1 preferably employ only two or theselugs, as shown, hut do not limit myself to this pnrtieuhtr number.

A screw holt- Il is eneireled by n sleeve 32 iii insulating mnteriul andprotected thereby 'l rom eontset with the lug 2.) through which thisserew hull. extends. A top 3?, of metal is mounted rigidly upon thescrew holt 31 and is sunken within the sleeve 32 o'l' insulatingmateriel. The serew holt 31 terminates in n eonieul point ZE-l whiehengages the. dinphrngm ll nnd u'll'ords a. means of completing therireuit theretln'ough. A screw bolt 35 is secured rigidly to the lug 30and a threaded nut 36 encircles this'serew and is movable relativelythereto. A wire 37 is eonnected with the lug 30 by aid of the bolt 35and nut 36, there. two parts serving as it binding post.

Another wire 38 is connected by the nut 39 With the screw bolt 31, thisnot and bolt serving as a binding post. The Wire 38 is thus inelectrical communication with the diaphragm. 9, While the wire 37 is inelectrical contact with the electrode 19.

My purpose in providing the bolt 3] with the tap 33 is to )revent thebolt from being thrown outwardly when the nut 39 is tightcned. Viheneverthis nut is tightened, not only is the wire 38 secured iirmly but thetap 33 is forced toward the center of the lug 29. The conoidal portion34 of the bolt 31 has a very small point engaging the diaphragm 0directly, this form being preferable because it ail'ords a reasonablecertainty that the electrical communication will be in every instanceestablished.

. The semi-circular easing s is provided with an aperture 40 throughwhich the wires 37, 38, properly insulated as shown, may be passed out.It will be noted that neither of the electrodes 18 or 19 is rcvolublealso that the electrode 19 is completely controllable as to distancefrom the mouth-piece by aid of movements of the adjusting nut inaemuchas the central portion ol the mica diaphragm 17 is normally stationary(being locked against he disk .21 by the nut 22), the peripheral orouter edge of the mica diaphragm l 7 is the only part thereof capable ofmoving. llence, when the diaphragm 9 vibrates, the carbon granuleswithin the space 20 are subjected to varying degrees of compression byvirtue of the fact that the outer edges of the diaphragm 1? can bendrelatively to the central portion of this diaphragm.

The construction above described presents quite a number o'l advantages.The fact that the cup 15 is merely sprung into position avoids thenecessity for soldering, lDl'iF/k -mica diaphragm 17.

ing or electro-plating, riveting or using screws. .1 have found that byusing only two-lugs 29, 30, so as to bind upon the diaphragm 9 at onlytwo points in. the circle. represented by its outer edge, the sounds aregreatly improved. This result Il attribute to the fact that thelimitation placed upon movements of the diai ihragm is reduced to aminimum and so distributed as to greatly lessen the interferencephenomena always present to a greater or lesser extent in the diaphragm.

1n the transmitter above described there is perfection of design,simplicity of parts, cheapness of construction, ease oi' adjustment anddurability. The diaphragm 9 is in contact with the stationary electrode19, only through the medium of the flexible The transmitter contains nosprings whatever.

I find that with the construction. above described. packing of thecarbon granules is 1 with much less apt to occur than is the case otherconstructions. In fact, in my improved transmitter it is very di'llicultto cause packing to take place, and even when the carbon. is packed, thetransmitter is restored to normal condition by merely speaking into it.I attribute this efl'ect largely to the use of the stationary frontelectrode in. connection with the diaphragm having tersion upon itsouter edge at two points only,

Having thus described my invention, it claim as new and desireto secureby Letters Patent:

1. In a transmitter, the combination of a vibratory diaphragm providedwith a sunken portion, a cup mounted Within said sunken portion andadhering thereto by its pressure thereupon, a second diaphragm engagingsaid sunken portion. and also engaging said cup, means for adjusting thetensionof said second-mentioned diaphragm, and inc-i ranism. numntodwithin said cup and control lablc by pressure for varying an electriccurrent.

2. In a transmitter, the combination oii a vibratory dia hra 'n )lOVldGdwith a'sunken portion in which is mounted a i up, a second diaphragmengaging said sunken portion and. also engaging said cup, an electrodesecured to the central portion of said. second diaphragm and. having athreaded stem through an opening in the saidsunken per tion of saidvibratory diaphragm.

3. in a transmitter, the combination of? a frame, a vibratory diaphragmprovided with a sunken portion in which is mounted a cup, a seconddiaphragm engaging said. sunken portion and also engaging said cup, andan electrode secured to the central portii said second diaphragm andhaving a thrt stem passing through an opening in th said sunken portionof said vibratory diaphragm and secured to said frame.

st. in a transmitter, the combination of a frame provided with a groove,a diaphragm mounted within a ring, said ring being disposed withinsaid'groove, a lug mounted upon said frame and. overlapping or portionsaid ring, a sleeve of insulating'imaterial mounted within said. lug, astem of conductmg material extending through said sleeve and said lug, atap secured rigidly upon so o. stem to prevent relative movementthereof, and a revoluble nut threaded upon said stein for the purpose olcausing the same to act as a binding post.

In testimony whereof I have sign-d my name to this specification in thepresence of two subscribing witnesses.

JESSE TEMPLE CUR'MS.

Witnesses I lion L. Hays, Ens-an S. Boon-err.

